Military buildings should be occupied by the player manually, means he can set which bulding should be the first one where the military goes to. A solution could be, that you can switch between "automatically occupying"(how it's is now and in the original) and "manually occupying" so that the player has to set a "shall to" number of soldiers, maybe class too. If without class, there could be at lower side of the window of the military building a a button with a "minus" to decrase the number of soldiers, in the middle the number of soldier who should be there (if all there it's the same like the count of pictures in the normal line) and on the right side a "plus" du incrase the number. The evacuating of military buildings can be solved that way too.
Thumb up for this idea.
I suggest to use the same 'system' as in Widelands game:
Manually changing capacity of military buildings. You are able to change the amount and type (weaker or stronger) of soldiers in each military building. Now you would be able to decide where your generals should go and how many soldiers you need in each building.
This could be very helpful. Now you are really taking control of your soldiers.